Uladzislau Rastarhuyeu

Current browserify-sign version has elliptic in dependency which contains security issue. Please update browserify-sign to fix it.

Add testing with help of GitHub actions. - Testing in parallel on Node v6, v8 and v10. - Job is trying to use `npm ci` if supported. - Also linting...

Tests code improvements

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- `var` replaced with `const` - anonymous functions replaced with arrow functions - PI value replaced with `Math.PI` constant - `equal` replaced with `strictEqual` since the first one was deprecated...

feature: Range decorator for numbers

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### Description There are two string length check decorators: `@MinLength` and `@MaxLength`. Additionally, there is a string decorator `@Length(min, max)` which checks if string length is in range between `min`...